Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminiumâs oxide layer repairs itself immediately.
Saliva helps remove oral waste and cavity-causing bacteria, protects teeth from decay by neutralizing harmful acids, and helps re-mineralize tooth enamel. Saliva also keeps oral tissues healthy by preventing infection by controlling bacteria and fungi in the mouth.
In any case salivary gland infections, though common, shouldn't be ignored as they can later on lead to stones. In rare cases uncured salivary gland infection can turn into cancer. When the flow of saliva from the ducts stops or slows down, the saliva in the glands may gradually solidify and turn into stone in the gland. There are hundreds of minor saliva glands that move saliva through narrow capillaries or ducts in to the mouth.